﻿#ifndef SRC_UTILS_AES_H
#define SRC_UTILS_AES_H



class ENCRYPT_ALGORITHM_API AES
{
public:
    AES(unsigned char* key);
    virtual ~AES();
    // 加密，传入的数组大小必须是16字节
    unsigned char* Cipher(unsigned char* input);
    // 解密，传入的数组也必须是16字节
    unsigned char* InvCipher(unsigned char* input);
    // 可以传入数组，大小必须是16的整数倍，如果不是将会越界操作；如果不传length而默认为0，那么将按照字符串处理，遇'\0'结束
    void* Cipher(void* input, int length = 0);
    // 必须传入数组和大小，必须是16的整数倍
    void* InvCipher(void* input, int length);

private:
    unsigned char Sbox[256];
    unsigned char InvSbox[256];
    unsigned char w[11][4][4];

    void KeyExpansion(unsigned char* key, unsigned char w[][4][4]);
    unsigned char FFmul(unsigned char a, unsigned char b);

    void SubBytes(unsigned char state[][4]);
    void ShiftRows(unsigned char state[][4]);
    void MixColumns(unsigned char state[][4]);
    void AddRoundKey(unsigned char state[][4], unsigned char k[][4]);

    void InvSubBytes(unsigned char state[][4]);
    void InvShiftRows(unsigned char state[][4]);
    void InvMixColumns(unsigned char state[][4]);
};

#endif    // SRC_UTILS_AES_H